EP0726413A1 - Valve actuated by the controlled fluid - Google Patents

Valve actuated by the controlled fluid Download PDF

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Publication number
EP0726413A1
EP0726413A1 EP95810092A EP95810092A EP0726413A1 EP 0726413 A1 EP0726413 A1 EP 0726413A1 EP 95810092 A EP95810092 A EP 95810092A EP 95810092 A EP95810092 A EP 95810092A EP 0726413 A1 EP0726413 A1 EP 0726413A1
Authority
EP
European Patent Office
Prior art keywords
chamber
valve
valve body
pressure
pressure chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95810092A
Other languages
German (de)
French (fr)
Other versions
EP0726413B1 (en
Inventor
Rudolf Kälin
Edelbert Tiefenthaler
Bruno Thomann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CCI AG
Original Assignee
Hexis AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to ES95810092T priority Critical patent/ES2125580T3/en
Application filed by Hexis AG filed Critical Hexis AG
Priority to EP95810092A priority patent/EP0726413B1/en
Priority to DE59504334T priority patent/DE59504334D1/en
Priority to PCT/CH1995/000045 priority patent/WO1996025615A1/en
Priority to JP8524548A priority patent/JPH09512329A/en
Priority to CA002163312A priority patent/CA2163312C/en
Priority to US08/575,534 priority patent/US5564674A/en
Publication of EP0726413A1 publication Critical patent/EP0726413A1/en
Application granted granted Critical
Publication of EP0726413B1 publication Critical patent/EP0726413B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/42—Actuating devices; Operating means; Releasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor
    • F16K31/423—Actuating devices; Operating means; Releasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor the actuated members consisting of multiple way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
    • F16K31/406—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston
    • F16K31/408—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston the discharge being effected through the piston and being blockable by an electrically-actuated member making contact with the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K39/00—Devices for relieving the pressure on the sealing faces
    • F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve

Definitions

  • the invention relates to a self-actuated, pilot-controllable valve according to the preamble of claim 1.
  • a valve of the type mentioned is known from EP-A 0 195 206.
  • This valve is frequently used to control safety systems, for example for steam generators, the opening and closing behavior, in particular the speed with which it reacts to control signals, being of crucial importance.
  • the valve body of the known valve is adjustable between an open position and a closed position via an electromagnet.
  • the known design is not suitable for a differentiated, controlled opening and / or closing movement of the valve body.
  • the invention has for its object to provide a valve of the type mentioned in particular in this regard further developed in a simple design, which have a targeted influence on the opening and closing movement of the Valve body, and thus the use of such a valve as a control valve enables through which the pressure medium, such as steam or water, can be released from a high pressure to a lower pressure.
  • the valve body designed as a compensating piston can be adjusted via the guide part in the sense of a sequence control between the closed position and a maximum open position and can be set in any intermediate positions within its stroke range.
  • the valve body is held in each intermediate position in the manner of a follower piston relative to the control piston in a compensating position, in which the central sub-chamber of the valve chamber is essentially closed off from the first sub-chamber and against the second sub-chamber and thus the connection between the first pressure chamber and the second Pressure chamber is interrupted.
  • a valve which can be actuated by steam as its own pressure medium has a housing 1 which contains a first pressure chamber 2 and a cover 3 which is fastened to an attachment of the housing 1 by means of screws 4.
  • the pressure chamber 2 is connected via a horizontal inlet connection 5 to a feed line (not shown) and via an outlet chamber 6 and a vertical outlet connection to an outlet line (not shown) for the pressure medium.
  • a bushing 7 which penetrates the pressure chamber 2 and in which a valve body 8 is slidably guided coaxially to the outlet connection by means of guide rings 10 and piston rings 11.
  • valve body 8 In the bushing 7, in the area of the transition between the first pressure chamber 2 and the outlet chamber 6, an annular, formed first valve seat 12 with which the valve body 8 cooperates.
  • the valve body 8 is displaceable between a closed position delimited by the valve seat 12 and a maximum open position delimited by the cover 3, its end part 8a facing away from the valve seat 12 interacting with and with the cover 3 via a protruding stop part 9, according to the illustration a screw head and the wall of the sleeve 7 delimits an end-side second pressure chamber 13.
  • the valve body 8 is designed as a compensating piston, the upper end section 8a being designed with a larger piston area than the lower end section 8b facing the valve seat 12.
  • the sleeve 7 is provided in a length section adjoining the valve seat 12 upstream with a plurality of passage openings for the pressure medium distributed over its circumference, which, as shown, are designed in the form of slots 14, which extend over the stroke range of the end part 8b of the valve seat 12 interacting with one another Extend valve body 8.
  • a defined, continuous or step-wise change in the valve cross-section through which the pressure medium can flow can be achieved with each stroke movement.
  • a valve chamber 17 is formed in the valve body 8 and communicates with the outlet chamber 6 of the housing 1 via an axial bore 18 of the valve body 8 which is open towards the lower end part 8b.
  • a guide part 20 which can be displaced coaxially with the valve body 8 and which contains a piston rod 21 which can be coupled to an actuating device 19 and has a control piston 22 arranged thereon and a sealing piston 23 which is arranged at a distance therefrom and which seals the valve chamber 17 against the second pressure chamber 13 seals flexibly.
  • the control piston 22 interacts with a second valve seat 26 arranged between the valve chamber 17 and the bore 18 and delimits a first piston surface 22a in the valve chamber 17 with its first piston surface 22a facing the second pressure chamber 13 Sub-chamber 17a, with its second piston surface 22b facing the second valve seat 26, a second sub-chamber 17b and with its lateral surface 22c a central sub-chamber 17c, which is designed in the form of an annular groove which locally widens the valve chamber 17.
  • the first partial chamber 17a is continuously connected via a first connecting channel 24 to the annular space 16 communicating with the first pressure chamber 2
  • the second partial chamber 17b is continuously connected to the outlet chamber 6 of the housing 1 via the bore 18 adjoining it
  • the middle partial chamber 17c is continuously connected to the front, second pressure chamber 13 via a second connecting channel 25.
  • the control piston 22 is in the valve chamber 17 between a first end position 22 '(FIG. 2a) delimited by the second valve seat 26, in which a mounting part 29 formed on the piston surface 22b closes the valve seat 26 and one closer to the second pressure chamber 13, as shown by a stop 27 for the sealing piston 23 limited second end position 22 '' (Fig.2b) adjustable.
  • the control piston 22 is designed with a middle length section, which is assigned to the middle part chamber 17c and can be sealingly applied to the walls of the first part chamber 17a and the second part chamber 17b and is delimited on both sides by end sections which are each provided with overflow channels in the form of longitudinal grooves 28a and 28b running in the axial direction.
  • the middle longitudinal section of the control piston 22, which is free of longitudinal grooves 28a, 28b, is designed with an axial dimension L, which is smaller by a certain under-coverage dimension than the corresponding axial dimension H of the middle sub-chamber 17c.
  • An embodiment is also possible in which the central piston section and the central partial chamber 17c have at least approximately the same axial dimensions L and H, respectively.
  • the control piston 22 is adjustable via the actuating device 19 between an upper stroke position shown in FIGS. 1 and 2, which corresponds to a regulated open position of the valve body 8 and a bottom stroke position, not shown, corresponding to the closed position of the valve body 8.
  • the control piston 22 assumes the first end position 22 '(FIG. 2a), in which the longitudinal grooves 28a establish an overflow connection between the subchambers 17a and 17c and thus a correspondingly throttled supply of the pressure medium allow the first pressure chamber 2 into the second pressure chamber 13, in which a correspondingly reduced pressure is built up.
  • this pressure acting on the upper end section 8a the valve body 8 with the lower end section 8b is pressed against the valve seat 12.
  • the control piston 22 assumes the second end position 22 ′′ (FIG. 2b), in which the longitudinal grooves 28a are held outside the partial chamber 17c, the supply of the pressure medium is blocked and the second valve seat 26 is released.
  • the longitudinal grooves 28b Through the longitudinal grooves 28b, an overflow connection between the subchambers 17c and 17b and thus between the second pressure chamber 13 and the outlet chamber 6 is established, so that the pressure medium can flow out of the second pressure chamber 13 and the valve body 8 essentially through the lower end section 8b and the pressure of the pressure medium acting on the upper annular surface 16b is kept in the maximum open position.
  • Corresponding overflow connections between the subchambers 17c and 17a or 17b can also be done in other ways, e.g. may be formed by end portions of the control piston 22, not shown, which are conically tapered in the intended overflow areas, or by bores made in the control piston 22, which in the respective end position 22 'or 22' 'reach the area of the central part chamber 17c.
  • a pneumatic actuating device can be provided as the actuating device 19, which can contain a controller 31, which can be influenced, for example, as a function of electrical control signals, and via which the control piston 22 continuously or in stages is adjustable within the adjustment range corresponding to the stroke range of the valve body 8 and can be locked in any intermediate positions.
  • the valve body 8 Due to the design of the control piston 22 and the valve chamber 17 described above, the valve body 8 is pilot-controlled in the manner of a follower piston, the pressure in the upper pressure chamber 13 being regulated so that the valve body 8 is in an intermediate position determined by the setting of the control piston 22 is applied via the upper end portion 8a, which corresponds to the upward pressure forces acting via the lower end portion 8b and the upper annular surface 16b.
  • valve body 8 is thus held in a compensating position according to FIG. 2, in which the valve chamber 17 receives the control piston 22 in a middle position between its two end positions 22 'and 22'', in which the middle part chamber 17c essentially through the middle length section of the control piston 22 is closed and separated from the adjacent subchambers 17a and 17b, so that the connection between the first pressure chamber 2 and the second, upper pressure chamber 13 is interrupted.
  • Each stroke movement of the control piston 22 brings about a corresponding adjustment movement of the valve body 8.
  • the control piston 22 is displaced against the valve seat 26, the connection between the subchambers 17a and 17c and thus between the annular space 16 and the upper pressure chamber 13 is established.
  • a pressure is built up in the pressure chamber 13, by means of which the valve body 8 tracks the control piston 22 and finally - in the compensation position according to FIG. 2 - in which the connection between the subchambers 17a and 17c is interrupted.
  • the adjustment of the valve body 8 advantageously requires low adjustment forces, which essentially consist of a spindle uplift force introduced onto the control piston 22 via the second (lower) piston surface 22b and a piston arrangement 21 arranged in the cover 3, as shown in the illustration of a stuffing box 32, acting on the piston rod Frictional force result.
  • the valve designed according to the invention allows the use of a relatively small, inexpensive, universally applicable actuator, which is largely independent of the pressure prevailing in the valve, in one for valves with different dimensions, for example with valve seat diameters from 100 mm to 500 mm, and suitable application can be manufactured in different areas of application.
  • the guide part 20 can contain a servo piston 35 which is arranged at a distance from the control piston 22 and which is guided in the valve body 8 in an equalizing chamber 36 shielded from the valve chamber 17 and in this an upper chamber facing the second pressure chamber 13 Cylinder space 36a and a lower cylinder space 36b facing the control piston 22 are delimited.
  • a servo piston 35 which is arranged at a distance from the control piston 22 and which is guided in the valve body 8 in an equalizing chamber 36 shielded from the valve chamber 17 and in this an upper chamber facing the second pressure chamber 13 Cylinder space 36a and a lower cylinder space 36b facing the control piston 22 are delimited.
  • the upper cylinder chamber 36a is connected via a first channel 37 to the correspondingly oriented first partial chamber 17a of the valve body 17, which is connected to the first pressure chamber 2, and the lower cylinder chamber 36b is connected to the valve chamber 17 via a second channel 38 middle sub-chamber 17c and the second pressure chamber 13 connecting second connecting channel 25 connected.
  • the first connecting duct 24 is connected to the central part space 17c, and via a duct 37 'to the lower cylinder space 36b, while the second connecting duct 25 is connected to the upper part space 17a, and via a duct 38' to the upper cylinder space 36a is connected.
  • the upper, second pressure chamber 13 is connected via the connecting channel 25 to the upper partial chamber 17a, which is closed off from the central partial chamber 17c, while the central partial chamber 17c communicating with the lower partial chamber 17b is connected via the annular space 16 is connected to the first pressure chamber 2 and via the bore 18 to the outlet chamber 6.
  • the valve body 8 is essentially held in the maximum open position shown by the pressure prevailing in the first pressure chamber 2 and acting on the lower end section 8b and the upper annular surface 16b.
  • the control piston 22 is moved against the second valve seat 26 to initiate a closing movement, the upper pressure chamber 13 and the upper cylinder chamber 36a are connected to the first pressure chamber 2 via the upper partial chamber 17a, the control piston 22 being actuated by the servo piston actuated via the cylinder chamber 36a 35 pressed by an additional adjusting force against the second valve seat 26 and thus a reliable closing of the valve is ensured.
  • the valve contains a first pressure chamber 2, an outlet chamber 6 and a valve body 8, which cooperates with a first valve seat 12 and is designed as a compensating piston, as well as a second pressure chamber 13 delimited by the latter.
  • the valve body 8 contains a cooperating with a second valve seat 26, between a closed position and an open position movable control piston 22. This delimits in a valve chamber 17 a first valve facing away from the second valve seat 26 and connected to the first pressure chamber 2 Partial chamber, a second partial chamber facing the second valve seat 26, connected to the outlet chamber 6, and a central partial chamber surrounding its lateral surface and connected to the second pressure chamber 13.
  • the control piston 22 establishes an overflow connection between the first and the middle partial chamber in the closed position, and an overflow connection between the second and the middle partial chamber in the open position.
  • the valve body 8 adjusts itself in the manner of a follower piston with respect to the control piston 22, which can be driven by an adjustable adjusting device 19, and can be adjusted in a controlled manner between the first valve seat 12 and different open positions.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)
  • Actuator (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

The valve comprises a first pressure chamber (2), an outlet chamber (6) and a valve body (8) working together with a first valve seat (12) along with a second pressure chamber (13). The valve body contains control piston (22) movable between a closed position and an open position which works together with a second valve seat (26). The control piston is contained in a valve chamber (17) and faces away from the second valve seat whilst a first part chamber of the first pressure chamber faces the second valve seat. The jacket surface of a second part chamber surrounds the outlet chamber and a middle part chamber is connected with the second pressure chamber. The control piston, whilst in the closed position, forms an overflow connection between the first and middle part chambers, and whilst in the open position forms an overflow connection between the second and middle part chambers.

Description

Die Erfindung betrifft ein eigenmediumbetätigtes, vorsteuerbares Ventil nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a self-actuated, pilot-controllable valve according to the preamble of claim 1.

Ein Ventil der genannten Art ist aus der EP-A 0 195 206 bekannt. Dieses Ventil wird häufig zur Steuerung von Sicherheitssystemen, beispielsweise für Dampferzeuger, eingesetzt, wobei das Oeffnungs- und Schliessverhalten, insbesondere die Schnelligkeit, mit der es auf Steuersignale reagiert, von ausschlaggebender Bedeutung ist. Der Ventilkörper des bekannten Ventils ist über einen Elektromagneten zwischen einer Offenstellung und einer Schliessstellung verstellbar. Die bekannte Ausführung ist jedoch für eine differenzierte, kontrollierte Oeffnungs- und/oder Schliessbewegung des Ventilkörpers nicht geeignet.A valve of the type mentioned is known from EP-A 0 195 206. This valve is frequently used to control safety systems, for example for steam generators, the opening and closing behavior, in particular the speed with which it reacts to control signals, being of crucial importance. The valve body of the known valve is adjustable between an open position and a closed position via an electromagnet. However, the known design is not suitable for a differentiated, controlled opening and / or closing movement of the valve body.

Der Erfindung liegt die Aufgabe zugrunde, ein insbesondere in dieser Hinsicht weiter entwickeltes Ventil der eingangs genannten Art in einer einfachen Ausführung zu schaffen, welche eine gezielte Beeinflussung der Oeffnungs- und Schliessbewegung des Ventilkörpers, und damit die Verwendung eines derartigen Ventils als Regelventil ermöglicht, durch welches das Druckmedium, z.B. Dampf oder Wasser, von einem hohen Druck auf einen tieferen Druck entspannt werden kann.The invention has for its object to provide a valve of the type mentioned in particular in this regard further developed in a simple design, which have a targeted influence on the opening and closing movement of the Valve body, and thus the use of such a valve as a control valve enables through which the pressure medium, such as steam or water, can be released from a high pressure to a lower pressure.

Diese Aufgabe wird erfindungsgemäss durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.According to the invention, this object is achieved by the characterizing features of claim 1.

Beim erfindungsgemäss ausgebildeten Ventil ist der als Ausgleichskolben ausgeführte Ventilkörper über den Führungsteil im Sinne einer Folgesteuerung zwischen der Schliessstellung und einer maximalen Offenstellung verstellbar und innerhalb seines Hubbereichs in beliebigen Zwischenstellungen einstellbar. Dabei wird der Ventilkörper in jeder Zwischenstellung nach Art eines Folgekolbens relativ zum Steuerkolben jeweils in einer Ausgleichsstellung gehalten, in welcher die mittlere Teilkammer der Ventilkammer im wesentlichen gegen die erste Teilkammer und gegen die zweite Teilkammer abgeschlossen und damit die Verbindung zwischen der ersten Druckkammer und der zweiten Druckkammer unterbrochen ist. Durch diese Ausführung ist insbesondere eine einfache Regelung des jeweils in der zweiten Druckkammer aufgebauten Drucks erzielbar, der auf die dem ersten Ventilsitz abgewandte Endpartie des Ventilkörpers einwirkt, und der in jeder Zwischenstellung des Ventilkörpers und bei jeder Verstellbewegung des Steuerkolbens, durch eine entsprechende Relativbewegung des Ventilkörpers gegenüber dem Steuerkolben, selbsttätig im Sinne eines Ausgleichs der auf den Ventilkörper einwirkenden Druckkräfte und Strömungskräfte beeinflusst wird. Bei der erfindungsgemässen Ausführung erfordert die Verstellung des Ventilkörpers vorteilhaft geringe Verstellkräfte, die durch einen relativ kleinen, kostengünstigen, universell einsetzbaren Stellantrieb aufgebracht werden können.In the valve designed according to the invention, the valve body designed as a compensating piston can be adjusted via the guide part in the sense of a sequence control between the closed position and a maximum open position and can be set in any intermediate positions within its stroke range. The valve body is held in each intermediate position in the manner of a follower piston relative to the control piston in a compensating position, in which the central sub-chamber of the valve chamber is essentially closed off from the first sub-chamber and against the second sub-chamber and thus the connection between the first pressure chamber and the second Pressure chamber is interrupted. With this design, in particular a simple regulation of the pressure built up in the second pressure chamber can be achieved, which acts on the end part of the valve body facing away from the first valve seat, and which in every intermediate position of the valve body and with each adjustment movement of the control piston, by a corresponding relative movement of the valve body compared to the control piston, is automatically influenced in the sense of a compensation of the pressure forces and flow forces acting on the valve body. In the embodiment according to the invention, the adjustment of the valve body advantageously requires low adjustment forces, which can be applied by a relatively small, inexpensive, universal actuator.

Ausgestaltungen der Erfindung sind in den abhängigen Patentansprüchen angegeben.Embodiments of the invention are specified in the dependent claims.

Weitere Merkmale und Einzelheiten ergeben sich aus der folgenden Beschreibung von in der Zeichnung schematisch dargestellten Ausführungsbeispielen nach der Erfindung. Es zeigen:

Fig.1
einen Längsschnitt durch ein mit einer Stelleinrichtung versehenes Ventil nach der Erfindung;
Fig.2
eine Einzelheit des Ventils nach Fig.1 in einer grösseren Darstellung;
Fig.2a und 2b
die Einzelheit nach Fig.2 je in einer anderen Betriebsstellung und
Fig.3 und 4
weitere Einzelheiten von Ventilen, je nach einer abgewandelten Ausführungsform.
Further features and details emerge from the following description of exemplary embodiments according to the invention shown schematically in the drawing. Show it:
Fig. 1
a longitudinal section through a valve provided with an actuator according to the invention;
Fig. 2
a detail of the valve of Figure 1 in a larger representation;
2a and 2b
the detail according to Figure 2 each in a different operating position and
Fig. 3 and 4
further details of valves, depending on a modified embodiment.

Gemäss Fig.1 weist ein von Dampf als eigenem Druckmedium betätigbares Ventil ein Gehäuse 1 auf, welches eine erste Druckkammer 2 und einen Deckel 3 enthält, der mittels Schrauben 4 an einem Ansatz des Gehäuses 1 befestigt ist. Die Druckkammer 2 ist über einen horizontalen Eintrittsstutzen 5 an eine nicht dargestellte Zuführleitung, und über eine Austrittskammer 6 und einen vertikalen Austrittsstutzen an eine nicht dargestellte Austrittsleitung für das Druckmedium angeschlossen. Im Gehäuse 1 ist eine die Druckkammer 2 durchsetzende Büchse 7 angeordnet, in der ein Ventilkörper 8 mittels Führungsringen 10 und Kolbenringen 11 koaxial zum Austrittsstutzen gleitend geführt ist. In der Büchse 7 ist im Bereich des Uebergangs zwischen der ersten Druckkammer 2 und der Austrittskammer 6 ein ringförmiger, erster Ventilsitz 12 ausgebildet, mit dem der Ventilkörper 8 zusammenwirkt. Der Ventilkörper 8 ist zwischen einer durch den Ventilsitz 12 begrenzten Schliessstellung und einer durch den Deckel 3 begrenzten, maximalen Offenstellung verschiebbar, wobei seine dem Ventilsitz 12 abgewandte Endpartie 8a über einen vorstehenden Anschlagteil 9, darstellungsgemäss einen Schraubenkopf, mit dem Deckel 3 zusammenwirkt und mit diesem und der Wand der Büchse 7 eine stirnseitige zweite Druckkammer 13 begrenzt. Der Ventilkörper 8 ist als Ausgleichskolben ausgebildet, wobei darstellungsgemäss die obere Endpartie 8a mit einer grösseren Kolbenfläche ausgeführt ist als die dem Ventilsitz 12 zugekehrte, untere Endpartie 8b.According to FIG. 1, a valve which can be actuated by steam as its own pressure medium has a housing 1 which contains a first pressure chamber 2 and a cover 3 which is fastened to an attachment of the housing 1 by means of screws 4. The pressure chamber 2 is connected via a horizontal inlet connection 5 to a feed line (not shown) and via an outlet chamber 6 and a vertical outlet connection to an outlet line (not shown) for the pressure medium. Arranged in the housing 1 is a bushing 7 which penetrates the pressure chamber 2 and in which a valve body 8 is slidably guided coaxially to the outlet connection by means of guide rings 10 and piston rings 11. In the bushing 7, in the area of the transition between the first pressure chamber 2 and the outlet chamber 6, an annular, formed first valve seat 12 with which the valve body 8 cooperates. The valve body 8 is displaceable between a closed position delimited by the valve seat 12 and a maximum open position delimited by the cover 3, its end part 8a facing away from the valve seat 12 interacting with and with the cover 3 via a protruding stop part 9, according to the illustration a screw head and the wall of the sleeve 7 delimits an end-side second pressure chamber 13. The valve body 8 is designed as a compensating piston, the upper end section 8a being designed with a larger piston area than the lower end section 8b facing the valve seat 12.

Die Büchse 7 ist in einem an den Ventilsitz 12 stromaufwärts anschliessenden Längenabschnitt mit mehreren, über ihren Umfang verteilten Durchtrittsöffnungen für das Druckmedium versehen, die darstellungsgemäss in Form von Schlitzen 14 ausgeführt sind, welche sich über den Hubbereich der mit dem Ventilsitz 12 zusammenwirkenden Endpartie 8b des Ventilkörpers 8 erstrecken. Entsprechend ist bei jeder Hubbewegung eine definierte, kontinuierliche oder stufenweise Veränderung des vom Druckmedium durchströmbaren Ventilquerschnitts erzielbar. In einem mittleren Längenabschnitt der Büchse 7 sind weitere, über deren Umfang verteilte Durchtrittsöffnungen in Form von Bohrungen 15 vorgesehen, welche die erste Druckkammer 2 mit einem am Umfang des Ventilkörpers 8 ausgebildeten, von der Büchse 7 umgebenen Ringraum 16 verbinden, der sich in jeder Hubstellung des Ventilkörpers 8 über die Bohrungen 15 erstreckt, und der somit ständig an die erste Druckkammer 2 angeschlossen ist. Der Ringraum 16 ist gegen die Austrittskammer 6 hin durch eine untere Ringfläche 16a, und gegen die Druckkammer 13 hin durch eine obere, darstellungsgemäss grössere Ringfläche 16b begrenzt, über die auf den Ventilkörper 8 eine nach oben gerichtete Druckkraft einwirkt.The sleeve 7 is provided in a length section adjoining the valve seat 12 upstream with a plurality of passage openings for the pressure medium distributed over its circumference, which, as shown, are designed in the form of slots 14, which extend over the stroke range of the end part 8b of the valve seat 12 interacting with one another Extend valve body 8. Correspondingly, a defined, continuous or step-wise change in the valve cross-section through which the pressure medium can flow can be achieved with each stroke movement. In a middle length section of the bushing 7 there are further passage openings distributed over its circumference in the form of bores 15 which connect the first pressure chamber 2 to an annular space 16 formed on the circumference of the valve body 8 and surrounded by the bushing 7 and which is in each stroke position of the valve body 8 extends over the bores 15, and which is thus continuously connected to the first pressure chamber 2. The annular space 16 is against the outlet chamber 6 through a lower annular surface 16a, and against the pressure chamber 13 through an upper, as shown larger ring area 16b bounded by an upward pressure force acts on the valve body 8.

Im Ventilkörper 8 ist eine Ventilkammer 17 ausgebildet, die über eine gegen die untere Endpartie 8b offene axiale Bohrung 18 des Ventilkörpers 8 mit der Austrittskammer 6 des Gehäuses 1 in Verbindung steht. In der Ventilkammer 17 ist ein zum Ventilkörper 8 koaxial verschiebbarer Führungsteil 20 angeordnet, der eine mit einer Betätigungseinrichtung 19 koppelbare Kolbenstange 21 mit einem darauf angeordneten Steuerkolben 22 und einem im Abstand von diesem angeordneten Dichtungskolben 23 enthält, welcher die Ventilkammer 17 gegen die zweite Druckkammer 13 beweglich abdichtet. Wie insbesondere aus den Fig.2, 2a und 2b hervorgeht, wirkt der Steuerkolben 22 mit einem zwischen der Ventilkammer 17 und der Bohrung 18 angeordneten zweiten Ventilsitz 26 zusammen und begrenzt in der Ventilkammer 17 mit seiner der zweiten Druckkammer 13 zugewandten ersten Kolbenfläche 22a eine erste Teilkammer 17a, mit seiner dem zweiten Ventilsitz 26 zugewandten zweiten Kolbenfläche 22b eine zweite Teilkammer 17b und mit seiner Mantelfläche 22c eine mittlere Teilkammer 17c, die in Form einer die Ventilkammer 17 örtlich erweiternden Ringnut ausgeführt ist. Die erste Teilkammer 17a ist über einen ersten Verbindungskanal 24 ständig an den mit der ersten Druckkammer 2 kommunizierenden Ringraum 16 angeschlossen, die zweite Teilkammer 17b ist über die an sie anschliessende Bohrung 18 ständig mit der Austrittskammer 6 des Gehäuses 1 verbunden, während die mittlere Teilkammer 17c über einen zweiten Verbindungskanal 25 ständig an die stirnseitige, zweite Druckkammer 13 angeschlossen ist.A valve chamber 17 is formed in the valve body 8 and communicates with the outlet chamber 6 of the housing 1 via an axial bore 18 of the valve body 8 which is open towards the lower end part 8b. Arranged in the valve chamber 17 is a guide part 20 which can be displaced coaxially with the valve body 8 and which contains a piston rod 21 which can be coupled to an actuating device 19 and has a control piston 22 arranged thereon and a sealing piston 23 which is arranged at a distance therefrom and which seals the valve chamber 17 against the second pressure chamber 13 seals flexibly. As can be seen in particular from FIGS. 2, 2a and 2b, the control piston 22 interacts with a second valve seat 26 arranged between the valve chamber 17 and the bore 18 and delimits a first piston surface 22a in the valve chamber 17 with its first piston surface 22a facing the second pressure chamber 13 Sub-chamber 17a, with its second piston surface 22b facing the second valve seat 26, a second sub-chamber 17b and with its lateral surface 22c a central sub-chamber 17c, which is designed in the form of an annular groove which locally widens the valve chamber 17. The first partial chamber 17a is continuously connected via a first connecting channel 24 to the annular space 16 communicating with the first pressure chamber 2, the second partial chamber 17b is continuously connected to the outlet chamber 6 of the housing 1 via the bore 18 adjoining it, while the middle partial chamber 17c is continuously connected to the front, second pressure chamber 13 via a second connecting channel 25.

Der Steuerkolben 22 ist in der Ventilkammer 17 zwischen einer durch den zweiten Ventilsitz 26 begrenzten ersten Endlage 22' (Fig.2a), in welcher eine an der Kolbenfläche 22b ausgebildete Aufsetzpartie 29 den Ventilsitz 26 verschliesst, und einer der zweiten Druckkammer 13 näher gelegenen, darstellungsgemäss durch einen Anschlag 27 für den Dichtungskolben 23 begrenzten zweiten Endlage 22'' (Fig.2b) verstellbar geführt. Wie aus den Figuren 2, 2a und 2b weiter hervorgeht, ist der Steuerkolben 22 mit einem der mittleren Teilkammer 17c zugeordneten, an die Wände der ersten Teilkammer 17a und der zweiten Teilkammer 17b dichtend anlegbaren mittleren Längenabschnitt ausgeführt, der beidseitig durch Endabschnitte begrenzt ist, welche je mit Ueberströmkanälen in Form von in axialer Richtung verlaufenden Längsnuten 28a bzw. 28b versehen sind. Der von Längsnuten 28a, 28b freie mittlere Längenabschnitt des Steuerkolbens 22 ist darstellungsgemäss mit einer axialen Abmessung L ausgeführt, welche um ein bestimmtes Unterdeckungsmass kleiner ist als die entsprechende axiale Abmessung H der mittleren Teilkammer 17c. Es ist auch eine Ausführung möglich, bei der der mittlere Kolbenabschnitt und die mittlere Teilkammer 17c zumindest annähernd gleiche axiale Abmessungen L bzw. H aufweisen.The control piston 22 is in the valve chamber 17 between a first end position 22 '(FIG. 2a) delimited by the second valve seat 26, in which a mounting part 29 formed on the piston surface 22b closes the valve seat 26 and one closer to the second pressure chamber 13, as shown by a stop 27 for the sealing piston 23 limited second end position 22 '' (Fig.2b) adjustable. As can further be seen from FIGS. 2, 2a and 2b, the control piston 22 is designed with a middle length section, which is assigned to the middle part chamber 17c and can be sealingly applied to the walls of the first part chamber 17a and the second part chamber 17b and is delimited on both sides by end sections which are each provided with overflow channels in the form of longitudinal grooves 28a and 28b running in the axial direction. The middle longitudinal section of the control piston 22, which is free of longitudinal grooves 28a, 28b, is designed with an axial dimension L, which is smaller by a certain under-coverage dimension than the corresponding axial dimension H of the middle sub-chamber 17c. An embodiment is also possible in which the central piston section and the central partial chamber 17c have at least approximately the same axial dimensions L and H, respectively.

Der Steuerkolben 22 ist über die Betätigungseinrichtung 19 zwischen einer in den Fig.1 und 2 dargestellten, einer geregelten Offenstellung des Ventilkörpers 8 entsprechenden oberen Hubstellung und einer nicht dargestellten, der Schliessstellung des Ventilkörpers 8 entsprechenden untersten Hubstellung verstellbar. In der Schliessstellung des Ventilkörpers 8 nimmt der Steuerkolben 22 die erste Endlage 22' (Fig.2a) ein, in welcher die Längsnuten 28a eine Ueberströmverbindung zwischen den Teilkammern 17a und 17c herstellen und damit eine entsprechend gedrosselte Zufuhr des Druckmediums aus der ersten Druckkammer 2 in die zweite Druckkammer 13 zulassen, in der ein entsprechend verminderter Druck aufgebaut wird. Durch diesen auf die obere Endpartie 8a einwirkenden Druck wird der Ventilkörper 8 mit der unteren Endpartie 8b an den Ventilsitz 12 angepresst.The control piston 22 is adjustable via the actuating device 19 between an upper stroke position shown in FIGS. 1 and 2, which corresponds to a regulated open position of the valve body 8 and a bottom stroke position, not shown, corresponding to the closed position of the valve body 8. In the closed position of the valve body 8, the control piston 22 assumes the first end position 22 '(FIG. 2a), in which the longitudinal grooves 28a establish an overflow connection between the subchambers 17a and 17c and thus a correspondingly throttled supply of the pressure medium allow the first pressure chamber 2 into the second pressure chamber 13, in which a correspondingly reduced pressure is built up. As a result of this pressure acting on the upper end section 8a, the valve body 8 with the lower end section 8b is pressed against the valve seat 12.

In der durch den Anschlag am Deckel 3 bestimmten, maximalen Offenstellung des Ventilkörpers 8 nimmt der Steuerkolben 22 die zweite Endlage 22'' (Fig.2b) ein, in welcher die Längsnuten 28a ausserhalb der Teilkammer 17c gehalten werden, die Zufuhr des Druckmediums gesperrt und der zweite Ventilsitz 26 freigegeben wird. Dabei wird durch die Längsnuten 28b eine Ueberströmverbindung zwischen den Teilkammern 17c und 17b und damit zwischen der zweiten Druckkammer 13 und der Austrittskammer 6 hergestellt, so dass das Druckmedium aus der zweiten Druckkammer 13 abströmen kann und der Ventilkörper 8 im wesentlichen durch den auf die untere Endpartie 8b und den auf die obere Ringfläche 16b einwirkenden Druck des Druckmediums in der maximalen Offenstellung gehalten wird.In the maximum open position of the valve body 8 determined by the stop on the cover 3, the control piston 22 assumes the second end position 22 ″ (FIG. 2b), in which the longitudinal grooves 28a are held outside the partial chamber 17c, the supply of the pressure medium is blocked and the second valve seat 26 is released. Through the longitudinal grooves 28b, an overflow connection between the subchambers 17c and 17b and thus between the second pressure chamber 13 and the outlet chamber 6 is established, so that the pressure medium can flow out of the second pressure chamber 13 and the valve body 8 essentially through the lower end section 8b and the pressure of the pressure medium acting on the upper annular surface 16b is kept in the maximum open position.

Entsprechende Überströmverbindungen zwischen den Teilkammern 17c und 17a bzw. 17b können auch auf andere Weise, z.B. durch nicht dargestellte, in den vorgesehenen Überströmbereichen konisch abgeschrägte Endpartien des Steuerkolbens 22, oder durch im Steuerkolben 22 angebrachte Bohrungen gebildet sein, die in der jeweiligen Endlage 22' bzw. 22'' in den Bereich der mittleren Teilkammer 17c gelangen.Corresponding overflow connections between the subchambers 17c and 17a or 17b can also be done in other ways, e.g. may be formed by end portions of the control piston 22, not shown, which are conically tapered in the intended overflow areas, or by bores made in the control piston 22, which in the respective end position 22 'or 22' 'reach the area of the central part chamber 17c.

Als Betätigungseinrichtung 19 kann eine pneumatische Stellvorrichtung vorgesehen sein, welche einen, z.B. in Abhängigkeit von elektrischen Steuersignalen beeinflussbaren, Regler 31 enthalten kann und über welche der Steuerkolben 22 kontinuierlich oder stufenweise innerhalb des dem Hubbereich des Ventilkörpers 8 entsprechenden Verstellbereichs verstellbar und in beliebigen Zwischenstellungen feststellbar geführt ist. Aufgrund der vorstehend beschriebenen Ausbildung des Steuerkolbens 22 und der Ventilkammer 17 wird der Ventilkörper 8 nach Art eines Folgekolbens vorgesteuert, wobei der Druck in der oberen Druckkammer 13 so geregelt wird, dass auf den Ventilkörper 8 in jeder durch die Einstellung des Steuerkolbens 22 bestimmten Zwischenstellung eine über die obere Endpartie 8a einwirkende Druckkraft ausgeübt wird, welche den über die untere Endpartie 8b und die obere Ringfläche 16b einwirkenden, nach oben gerichteten Druckkräften entspricht.A pneumatic actuating device can be provided as the actuating device 19, which can contain a controller 31, which can be influenced, for example, as a function of electrical control signals, and via which the control piston 22 continuously or in stages is adjustable within the adjustment range corresponding to the stroke range of the valve body 8 and can be locked in any intermediate positions. Due to the design of the control piston 22 and the valve chamber 17 described above, the valve body 8 is pilot-controlled in the manner of a follower piston, the pressure in the upper pressure chamber 13 being regulated so that the valve body 8 is in an intermediate position determined by the setting of the control piston 22 is applied via the upper end portion 8a, which corresponds to the upward pressure forces acting via the lower end portion 8b and the upper annular surface 16b.

Der Ventilkörper 8 wird somit jeweils in einer Ausgleichsstellung gemäss Fig.2 gehalten, in welcher die Ventilkammer 17 den Steuerkolben 22 in einer zwischen dessen beiden Endlagen 22' und 22'' sich einstellenden Mittellage aufnimmt, in der die mittlere Teilkammer 17c im wesentlichen durch den mittleren Längenabschnitt des Steuerkolbens 22 verschlossen und von den benachbarten Teilkammern 17a und 17b getrennt ist, so dass die Verbindung zwischen der ersten Druckkammer 2 und der zweiten, oberen Druckkammer 13 unterbrochen ist.Bei der dargestellten Ausführung kann in dieser Ausgleichsstellung zwischen den Teilkammern 17c und 17a bzw. 17b, aufgrund der im Bereich des mittleren Längenabschnitts des Steuerkolbens 22 vorgesehenen, vorstehend erwähnten Unterdeckung gegenüber der mittleren Teilkammer 17c, jeweils eine geringfügige Leckageströmung auftreten, durch welche die Gefahr von durch Verstellen des Ventilkörpers 8 verursachten Druckstössen vermindert werden kann.The valve body 8 is thus held in a compensating position according to FIG. 2, in which the valve chamber 17 receives the control piston 22 in a middle position between its two end positions 22 'and 22'', in which the middle part chamber 17c essentially through the middle length section of the control piston 22 is closed and separated from the adjacent subchambers 17a and 17b, so that the connection between the first pressure chamber 2 and the second, upper pressure chamber 13 is interrupted. In the illustrated embodiment, in this compensation position between the subchambers 17c and 17a or 17b, due to the above-mentioned undercoverage in the region of the central longitudinal section of the control piston 22 relative to the central sub-chamber 17c, a slight leakage flow occurs, by means of which the risk of pressure surges caused by adjusting the valve body 8 can be reduced.

Jede Hubbewegung des Steuerkolbens 22 bewirkt eine entsprechende Verstellbewegung des Ventilkörpers 8. Bei einer Verschiebung des Steuerkolbens 22 gegen den Ventilsitz 26 wird die Verbindung zwischen den Teilkammern 17a und 17c und damit zwischen dem Ringraum 16 und der oberen Druckkammer 13 hergestellt. Entsprechend wird in der Druckkammer 13 ein Druck aufgebaut, durch den der Ventilkörper 8 dem Steuerkolben 22 nachgeführt und schliesslich - durch die je gegeneinander wirkenden Druckkräfte und Strömungskräfte - in der Ausgleichsstellung gemäss Fig.2 gehalten wird, in der die Verbindung zwischen den Teilkammern 17a und 17c unterbrochen ist. Bei einer Verschiebung des Steuerkolbens 22 gegen die obere Druckkammer 13 wird die Verbindung zwischen den Teilkammern 17c und 17b und damit zwischen der Druckkammer 13 und der Austrittskammer 6 hergestellt, so dass das Druckmedium aus der Druckkammer 13 verdrängt werden kann und der Ventilkörper 8 in einer entsprechenden Abhebebewegung dem Steuerkolben 22 nachgeführt und schliesslich in der Ausgleichsstellung gehalten wird.Each stroke movement of the control piston 22 brings about a corresponding adjustment movement of the valve body 8. When the control piston 22 is displaced against the valve seat 26, the connection between the subchambers 17a and 17c and thus between the annular space 16 and the upper pressure chamber 13 is established. Correspondingly, a pressure is built up in the pressure chamber 13, by means of which the valve body 8 tracks the control piston 22 and finally - in the compensation position according to FIG. 2 - in which the connection between the subchambers 17a and 17c is interrupted. When the control piston 22 is displaced against the upper pressure chamber 13, the connection between the subchambers 17c and 17b and thus between the pressure chamber 13 and the outlet chamber 6 is established, so that the pressure medium can be displaced from the pressure chamber 13 and the valve body 8 in a corresponding one Lifting movement tracks the control piston 22 and is finally held in the compensating position.

Die Verstellung des Ventilkörpers 8 erfordert vorteilhaft geringe Verstellkräfte, die im wesentlichen aus einer über die zweite (untere) Kolbenfläche 22b auf den Steuerkolben 22 eingeleiteten Spindelauftriebskraft und einer auf die Kolbenstange 21 im Bereich einer im Deckel 3 angeordneten Dichtungsanordnung, darstellungsgemäss einer Stopfbüchse 32, einwirkenden Reibungskraft resultieren. Das erfindungsgemäss ausgeführte Ventil gestattet die Verwendung eines relativ kleinen, kostengünstigen, universell einsetzbaren Stellantriebs, welcher weitgehend unabhängig von dem im Ventil herrschenden Druck, in einer für Ventile mit unterschiedlichen Abmessungen, z.B. mit Ventilsitzdurchmessern von 100 mm bis 500 mm, und unterschiedlichen Anwendungsbereichen geeigneten Ausführung hergestellt werden kann.The adjustment of the valve body 8 advantageously requires low adjustment forces, which essentially consist of a spindle uplift force introduced onto the control piston 22 via the second (lower) piston surface 22b and a piston arrangement 21 arranged in the cover 3, as shown in the illustration of a stuffing box 32, acting on the piston rod Frictional force result. The valve designed according to the invention allows the use of a relatively small, inexpensive, universally applicable actuator, which is largely independent of the pressure prevailing in the valve, in one for valves with different dimensions, for example with valve seat diameters from 100 mm to 500 mm, and suitable application can be manufactured in different areas of application.

In den Ausführungsbeispielen sind einander entsprechende Teile mit gleichen Bezugszeichen versehen. Entsprechend der Darstellung nach den Fig.3 und 4 kann der Führungsteil 20 einen im Abstand vom Steuerkolben 22 angeordneten Servokolben 35 enthalten, der im Ventilkörper 8 in einer von der Ventilkammer 17 abgeschirmten Ausgleichskammer 36 geführt ist und in dieser einen der zweiten Druckkammer 13 zugewandten oberen Zylinderraum 36a und einen dem Steuerkolben 22 zugewandten unteren Zylinderraum 36b begrenzt. Bei der Ausführung nach Fig.3 ist der obere Zylinderraum 36a über einen ersten Kanal 37 an die entsprechend orientierte, mit dem ersten Druckraum 2 verbundene erste Teilkammer 17a des Ventilkörpers 17 angeschlossen, und der untere Zylinderraum 36b ist über einen zweiten Kanal 38 an den die mittlere Teilkammer 17c und die zweite Druckkammer 13 verbindenden zweiten Verbindungskanal 25 angeschlossen. Bei dieser Ausführung wird, wenn der Steuerkolben 22 die dargestellte zweite, obere Endlage 22'' einnimmt, der obere Zylinderraum 36a mit der ersten Druckkammer 2 verbunden, wobei auf den Ventilkörper 8 eine gegen die obere Druckkammer 13 gerichtete Verstellkraft ausgeübt wird, durch welche eine allfällige Blockierung des Ventilkörpers 8, z.B. nach längerem Verharren des Ventilkörpers 8 in der Schliessstellung oder in einer bestimmten mittleren Hubstellung, überwunden und ein sicheres Oeffnen des Ventils gewährleistet werden kann.In the exemplary embodiments, parts which correspond to one another are provided with the same reference symbols. 3 and 4, the guide part 20 can contain a servo piston 35 which is arranged at a distance from the control piston 22 and which is guided in the valve body 8 in an equalizing chamber 36 shielded from the valve chamber 17 and in this an upper chamber facing the second pressure chamber 13 Cylinder space 36a and a lower cylinder space 36b facing the control piston 22 are delimited. In the embodiment according to FIG. 3, the upper cylinder chamber 36a is connected via a first channel 37 to the correspondingly oriented first partial chamber 17a of the valve body 17, which is connected to the first pressure chamber 2, and the lower cylinder chamber 36b is connected to the valve chamber 17 via a second channel 38 middle sub-chamber 17c and the second pressure chamber 13 connecting second connecting channel 25 connected. In this embodiment, when the control piston 22 assumes the illustrated second, upper end position 22 ″, the upper cylinder space 36a is connected to the first pressure chamber 2, an adjusting force directed against the upper pressure chamber 13 being exerted on the valve body 8, by means of which an adjusting force is exerted possible blocking of the valve body 8, for example after a long persistence of the valve body 8 in the closed position or in a certain middle stroke position, can be overcome and a safe opening of the valve can be guaranteed.

Bei der Ausführung nach Fig.4 ist der erste Verbindungskanal 24 an den mittleren Teilraum 17c, und über einen Kanal 37' an den unteren Zylinderraum 36b angeschlossen, während der zweite Verbindungskanal 25 an den oberen Teilraum 17a, und über einen Kanal 38' an den oberen Zylinderraum 36a angeschlossen ist. Entsprechend ist in der dargestellten oberen Endlage 22'' des Steuerkolbens 22 die obere, zweite Druckkammer 13 über den Verbindungskanal 25 an die gegen die mittlere Teilkammer 17c abgeschlossene obere Teilkammer 17a angeschlossen, während die mit der unteren Teilkammer 17b kommunizierende mittlere Teilkammer 17c über den Ringraum 16 an die erste Druckkammer 2, und über die Bohrung 18 an die Austrittskammer 6 angeschlossen ist. Der Ventilkörper 8 wird im wesentlichen durch den in der ersten Druckkammer 2 herrschenden, auf die untere Endpartie 8b und die obere Ringfläche 16b einwirkenden Druck in der dargestellten maximalen Offenstellung gehalten. Wenn der Steuerkolben 22 zur Einleitung einer Schliessbewegung gegen den zweiten Ventilsitz 26 bewegt wird, werden die obere Druckkammer 13 und der obere Zylinderraum 36a über die obere Teilkammer 17a mit der ersten Druckkammer 2 verbunden, wobei der Steuerkolben 22 durch den über den Zylinderraum 36a beaufschlagten Servokolben 35 durch eine zusätzliche Verstellkraft gegen den zweiten Ventilsitz 26 gepresst und damit ein sicheres Schliessen des Ventils gewährleistet wird.In the embodiment according to FIG. 4, the first connecting duct 24 is connected to the central part space 17c, and via a duct 37 'to the lower cylinder space 36b, while the second connecting duct 25 is connected to the upper part space 17a, and via a duct 38' to the upper cylinder space 36a is connected. Accordingly, in the illustrated upper end position 22 ″ of the control piston 22, the upper, second pressure chamber 13 is connected via the connecting channel 25 to the upper partial chamber 17a, which is closed off from the central partial chamber 17c, while the central partial chamber 17c communicating with the lower partial chamber 17b is connected via the annular space 16 is connected to the first pressure chamber 2 and via the bore 18 to the outlet chamber 6. The valve body 8 is essentially held in the maximum open position shown by the pressure prevailing in the first pressure chamber 2 and acting on the lower end section 8b and the upper annular surface 16b. When the control piston 22 is moved against the second valve seat 26 to initiate a closing movement, the upper pressure chamber 13 and the upper cylinder chamber 36a are connected to the first pressure chamber 2 via the upper partial chamber 17a, the control piston 22 being actuated by the servo piston actuated via the cylinder chamber 36a 35 pressed by an additional adjusting force against the second valve seat 26 and thus a reliable closing of the valve is ensured.

Zusammenfassend lässt sich die Erfindung wie folgt beschreiben:
Das Ventil enthält eine erste Druckkammer 2, eine Austrittskammer 6 und einen mit einem ersten Ventilsitz 12 zusammenwirkenden,als Ausgleichskolben ausgeführten Ventilkörper 8 sowie eine durch diesen begrenzte zweite Druckkammer 13. Der Ventilkörper 8 enthält einen mit einem zweiten Ventilsitz 26 zusammenwirkenden, zwischen einer Schliessstellung und einer Offenstellung beweglichen Steuerkolben 22. Dieser begrenzt in einer Ventilkammer 17 eine dem zweiten Ventilsitz 26 abgewandte, mit der ersten Druckkammer 2 verbundene erste Teilkammer, eine dem zweiten Ventilsitz 26 zugewandte, mit der Austrittskammer 6 verbundene zweite Teilkammer und eine seine Mantelfläche umgebende, mit der zweiten Druckkammer 13 verbundene mittlere Teilkammer. Der Steuerkolben 22 stellt jeweils in der Schliessstellung eine Überströmverbindung zwischen der ersten und der mittleren Teilkammer, und in der Offenstellung eine Überströmverbindung zwischen der zweiten und der mittleren Teilkammer her. Der Ventilkörper 8 stellt sich jeweils nach Art eines Folgekolbens bezüglich des über eine regelbare Stellvorrichtung 19 antreibbaren Steuerkolbens 22 ein, und ist über diesen zwischen dem ersten Ventilsitz 12 und unterschiedlichen Offenstellungen kontrolliert verstellbar.In summary, the invention can be described as follows:
The valve contains a first pressure chamber 2, an outlet chamber 6 and a valve body 8, which cooperates with a first valve seat 12 and is designed as a compensating piston, as well as a second pressure chamber 13 delimited by the latter. The valve body 8 contains a cooperating with a second valve seat 26, between a closed position and an open position movable control piston 22. This delimits in a valve chamber 17 a first valve facing away from the second valve seat 26 and connected to the first pressure chamber 2 Partial chamber, a second partial chamber facing the second valve seat 26, connected to the outlet chamber 6, and a central partial chamber surrounding its lateral surface and connected to the second pressure chamber 13. The control piston 22 establishes an overflow connection between the first and the middle partial chamber in the closed position, and an overflow connection between the second and the middle partial chamber in the open position. The valve body 8 adjusts itself in the manner of a follower piston with respect to the control piston 22, which can be driven by an adjustable adjusting device 19, and can be adjusted in a controlled manner between the first valve seat 12 and different open positions.

Anstelle der dargestellten pneumatischen Stellvorrichtung 19 kann auch eine andere, z. B.hydraulische oder elektromechanische Betätigungsvorrichtung vorgesehen sein.Instead of the pneumatic actuator 19 shown, another, for. B. hydraulic or electromechanical actuator may be provided.

Claims (13)

Eigenmediumbetätigtes, vorsteuerbares Ventil mit einem von einem Druckmedium durchströmbaren Gehäuse, welches eine erste Druckkammer (2), eine Austrittskammer (6) und einen ersten Ventilsitz (12) aufweist und einen mit diesem zusammenwirkenden Ventilkörper (8) sowie eine zweite Druckkammer (13) enthält, die durch eine dem Ventilsitz (12) abgewandte Kolbenfläche (8a) des Ventilkörpers (8) begrenzt ist, wobei der Ventilkörper (8) eine Ventilkammer (17) mit einem zweiten Ventilsitz (26) aufweist und einen mit diesem zusammenwirkenden, durch Antriebsmittel antreibbaren Steuerkolben (22) enthält, welcher zwischen einer Schliessstellung (22'), und einer Offenstellung (22'') beweglich geführt ist,
dadurch gekennzeichnet, dass der Ventilkörper (8) als Ausgleichskolben ausgeführt ist, dass der Steuerkolben (22) in der Ventilkammer (17) eine dem zweiten Ventilsitz (26) abgewandte, mit einer der Druckkammern (2 oder 13) verbundene erste Teilkammer (17a) und eine dem zweiten Ventilsitz (26) zugewandte, mit der Austrittskammer (6) verbundene zweite Teilkammer (17b) sowie eine seine Mantelfläche (22c) umgebende, mit der anderen Druckkammer (13 bzw. 2) verbundene mittlere Teilkammer (17c) begrenzt, und dass jeweils in der Schliessstellung (22') des Steuerkolbens (22) eine Ueberströmverbindung zwischen der ersten Teilkammer (17a) und der mittleren Teilkammer (17c), und in der Offenstellung (22'') eine Überströmverbindung zwischen der zweiten Teilkammer (17b) und der mittleren Teilkammer (17c) besteht.Self-actuated, pre-controllable valve with a housing through which a pressure medium can flow, which has a first pressure chamber (2), an outlet chamber (6) and a first valve seat (12) and contains a valve body (8) which interacts with it and a second pressure chamber (13) which is delimited by a piston surface (8a) of the valve body (8) facing away from the valve seat (12), the valve body (8) having a valve chamber (17) with a second valve seat (26) and one which can be driven by drive means and which cooperate therewith Contains control piston (22) which is movably guided between a closed position (22 ') and an open position (22''),
characterized in that the valve body (8) is designed as a compensating piston, that the control piston (22) in the valve chamber (17) has a first partial chamber (17a) facing away from the second valve seat (26) and connected to one of the pressure chambers (2 or 13) and a second partial chamber (17b) facing the second valve seat (26), connected to the outlet chamber (6) and a central partial chamber (17c) surrounding its lateral surface (22c) and connected to the other pressure chamber (13 or 2), and that in each case in the closed position (22 ') of the control piston (22) there is an overflow connection between the first part chamber (17a) and the middle part chamber (17c), and in the open position (22'') there is an overflow connection between the second Sub-chamber (17b) and the central sub-chamber (17c). Ventil nach Anspruch 1, dadurch gekennzeichnet, dass die Überströmverbindungen durch am Steuerkolben (22) vorgesehene Überströmkanäle gebildet sind.Valve according to claim 1, characterized in that the overflow connections are formed by overflow channels provided on the control piston (22). Ventil nach Anspruch 2, dadurch gekennzeichnet, dass der Steuerkolben (22) mit einem zum Zusammenwirken mit der ersten (17a) und der zweiten Teilkammer (17b) bestimmten, an deren Wände dichtend anlegbaren mittleren Kolbenabschnitt ausgeführt ist, der beidseitig durch Endabschnitte begrenzt ist, in denen die zum Zusammenwirken mit der mittleren Teilkammer (17c) bestimmten Ueberströmkanäle in Form von im wesentlichen in axialer Richtung verlaufenden Nuten (28a, 28b) ausgeführt sind.Valve according to Claim 2, characterized in that the control piston (22) is designed with a central piston section, which is intended to cooperate with the first (17a) and the second partial chamber (17b) and can be sealed against the walls and is delimited on both sides by end sections, in which the overflow channels intended for cooperation with the central partial chamber (17c) are designed in the form of grooves (28a, 28b) which run essentially in the axial direction. Ventil nach Anspruch 3, dadurch gekennzeichnet, dass der mittlere Kolbenabschnitt mit einer axialen Abmessung (L) ausgeführt ist, die kleiner ist als die entsprechende axiale Abmessung (H) der mittleren Teilkammer (17c).Valve according to claim 3, characterized in that the central piston section is designed with an axial dimension (L) which is smaller than the corresponding axial dimension (H) of the central partial chamber (17c). Ventil nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Ventilkörper (8) in einer die erste Druckkammer (2) des Gehäuses durchsetzenden Büchse (7) geführt ist, welche den ersten Ventilsitz (12) enthält und welche in einem an diesen anschliessenden Längenabschnitt, der einem vorbestimmten Hubbereich des Ventilkörpers (8) entspricht, sowie im Bereich eines am Ventilkörper (8) ausgebildeten, mit der Ventilkammer (17) kommunizierenden Ringraums (16) mit Durchtrittsöffnungen (14, 15) für das Druckmedium ausgeführt ist.Valve according to one of the preceding claims, characterized in that the valve body (8) is guided in a bushing (7) which passes through the first pressure chamber (2) of the housing and which contains the first valve seat (12) and in a length section adjoining this , which corresponds to a predetermined stroke range of the valve body (8), and in the area of an annular space (16), which is formed on the valve body (8) and communicates with the valve chamber (17) and has through openings (14, 15) for the pressure medium. Ventil nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Steuerkolben (22) mit einem Servokolben (35) gekoppelt ist, welcher in einer von der Ventilkammer (17) abgeschirmten Ausgleichskammer (36) des Ventilkörpers (8) geführt ist und in dieser zwei Zylinderräume (36a, 36b) begrenzt, von denen der eine mit der ersten Druckkammer (2) des Gehäuses, und der andere mit der zweiten Druckkammer (13) in Verbindung steht.Valve according to one of the preceding claims, characterized in that the control piston (22) is coupled to a servo piston (35) which is guided in a compensation chamber (36) of the valve body (8) shielded from the valve chamber (17) and two in this Cylinder spaces (36a, 36b) delimited, one of which communicates with the first pressure chamber (2) of the housing and the other with the second pressure chamber (13). Ventil nach Anspruch 6, dadurch gekennzeichnet, dass je einer der Zylinderräume (36a und 36b) der Ausgleichskammer (36) und je eine der Teilkammern (17a bzw. 17b) der Ventilkammer (17) über einen gemeinsamen Verbindungskanal (24 bzw. 25) an die zugeordnete Druckkammer (2 bzw. 13) angeschlossen sind.Valve according to claim 6, characterized in that one of the cylinder spaces (36a and 36b) of the compensation chamber (36) and one of the partial chambers (17a and 17b) of the valve chamber (17) via a common connecting channel (24 and 25) the assigned pressure chamber (2 or 13) are connected. Ventil nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die erste Teilkammer (17a) des Ventilkörpers (8) über einen ersten Verbindungskanal (24) an die erste Druckkammer (2) des Gehäuses angeschlossen ist, und dass die mittlere Teilkammer (17c) über einen zweiten Verbindungskanal (25) an die zweite Druckkammer (13) angeschlossen ist.Valve according to one of the preceding claims, characterized in that the first partial chamber (17a) of the valve body (8) is connected via a first connecting channel (24) to the first pressure chamber (2) of the housing, and in that the central partial chamber (17c) via a second connecting channel (25) is connected to the second pressure chamber (13). Ventil nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die mittlere Teilkammer (17c) des Ventilkörpers (8) über einen ersten Verbindungskanal (24) an die erste Druckkammer (2) des Gehäuses angeschlossen ist, und dass die erste Teilkammer (17a) über einen zweiten Verbindungskanal (25) an die zweite Druckkammer (13) angeschlossen ist.Valve according to one of claims 1 to 7, characterized in that the central partial chamber (17c) of the valve body (8) is connected via a first connecting channel (24) to the first pressure chamber (2) of the housing, and in that the first partial chamber (17a ) is connected to the second pressure chamber (13) via a second connecting channel (25). Ventil nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass als Antriebsmittel für den Steuerkolben (22) eine regelbare Betätigungseinrichtung (19) vorgesehen ist, über welche der Steuerkolben (22) innerhalb einer definierten Hublänge, die dem Hubbereich des Ventilkörpers (8) entspricht, verstellbar und in mindestens einer Zwischenstellung feststellbar gehalten ist.Valve according to one of the preceding claims, characterized in that a controllable actuating device (19) is provided as drive means for the control piston (22), via which the control piston (22) within a defined stroke length, which corresponds to the stroke range of the valve body (8), adjustable and held in at least one intermediate position. Ventil nach Anspruch 10, dadurch gekennzeichnet, dass die Betätigungseinrichtung (19) eine pneumatische Stellvorrichtung enthält.Valve according to claim 10, characterized in that the actuating device (19) contains a pneumatic actuating device. Ventil nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass die Betätigungseinrichtung (19) an einen in Abhängigkeit von elektrischen Steuersignalen beeinflussbaren Regler (31) angeschlossen und über diesen stufenweise verstellbar ist.Valve according to Claim 10 or 11, characterized in that the actuating device (19) is connected to a controller (31) which can be influenced as a function of electrical control signals and can be adjusted in steps therewith. Verwendung eines Ventils nach einem der vorangehenden Ansprüche als verstellbares Regelventil zum Entspannen eines Druckmediums, z.B. Dampf und/oder Wasser, von einem hohen Druck auf einen tieferen Druck.Use of a valve according to one of the preceding claims as an adjustable control valve for releasing a pressure medium, e.g. Steam and / or water, from a high pressure to a lower pressure.
EP95810092A 1995-02-13 1995-02-13 Valve actuated by the controlled fluid Expired - Lifetime EP0726413B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP95810092A EP0726413B1 (en) 1995-02-13 1995-02-13 Valve actuated by the controlled fluid
DE59504334T DE59504334D1 (en) 1995-02-13 1995-02-13 Self-operated valve
ES95810092T ES2125580T3 (en) 1995-02-13 1995-02-13 CONTROLLED FLUID OPERATED VALVE.
JP8524548A JPH09512329A (en) 1995-02-13 1995-02-28 Valve operated by its own medium
PCT/CH1995/000045 WO1996025615A1 (en) 1995-02-13 1995-02-28 Valve operated by its own medium
CA002163312A CA2163312C (en) 1995-02-13 1995-11-20 A valve actuated by its own medium
US08/575,534 US5564674A (en) 1995-02-13 1995-12-20 Valve actuated by its own medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95810092A EP0726413B1 (en) 1995-02-13 1995-02-13 Valve actuated by the controlled fluid

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EP0726413A1 true EP0726413A1 (en) 1996-08-14
EP0726413B1 EP0726413B1 (en) 1998-11-25

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US (1) US5564674A (en)
EP (1) EP0726413B1 (en)
JP (1) JPH09512329A (en)
CA (1) CA2163312C (en)
DE (1) DE59504334D1 (en)
ES (1) ES2125580T3 (en)
WO (1) WO1996025615A1 (en)

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US20030178530A1 (en) * 2002-01-31 2003-09-25 Marotta Scientific Controls, Inc. System for decreasing the speed of a moving craft
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Also Published As

Publication number Publication date
CA2163312A1 (en) 1996-08-14
DE59504334D1 (en) 1999-01-07
CA2163312C (en) 1999-11-09
JPH09512329A (en) 1997-12-09
WO1996025615A1 (en) 1996-08-22
US5564674A (en) 1996-10-15
EP0726413B1 (en) 1998-11-25
ES2125580T3 (en) 1999-03-01

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